30%X-30%X-[(X-30%X)×20%-2]-30%X=28怎么解

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30%X-30%X-[(X-30%X)×20%-2]-30%X=28怎么解
30%X-30%X-[(X-30%X)×20%-2]-30%X=28怎么解

30%X-30%X-[(X-30%X)×20%-2]-30%X=28怎么解
30%X-30%X-[(X-30%X)×20%-2]-30%X=28
0-(0.7X×0.2-2)-0.3X=28
-0.14X+2-0.3X=28
0.44X=-26
X=-59又11分之1

(x+30)*(x-18)=x*x 30/x=30/(x-1.5)-x x-30-0.2x=0.5x 3X+30+X+X-15=? 0.8x=x-30 x= x+35=(x+3x)*30% 60x（x-4)=30x 80%x+30-x=10%x x ( x-30)= -67.5 X=? X-30%X+8-X=20 30%x=50%x-20x x-(30-x)=(30-x)-x/3,怎么解 x-30%x=(280-x)+30%x X×X-(X-10)(X-10)=30×30 x^2=(x+30)X(x-18)怎么解 (25/X)X(30/X)= 15/X怎么算 X/(x-30)=(x+40)/X解方程, 50％x+x=20 x+30％x=52